 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.views.tasklist;

 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.jface.util.OpenStrategy;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.PartInitException;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.ide.IDE;
 import org.eclipse.ui.internal.ide.DialogUtil;
 import org.eclipse.ui.internal.views.tasklist.TaskListMessages;

 /**
  * This action opens an editor for the resource
  * associated with the selected marker, and
  * jumps to the marker's location in the editor.
  */
 class GotoTaskAction extends TaskAction {

     /**
      * Creates the action.
      *
      * @param tasklist the task list
      * @param id the id
      */
     public GotoTaskAction(TaskList tasklist, String id) {
         super(tasklist, id);
         PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
                 ITaskListHelpContextIds.GOTO_TASK_ACTION);
     }

     /**
      * Performs this action. This action works only for single selection.
      */
     public void run() {
         IStructuredSelection selection = (IStructuredSelection) getTaskList()
                 .getSelection();
         Object o = selection.getFirstElement();
         if (!(o instanceof IMarker)) {
             return;
         }
         IMarker marker = (IMarker) o;
         IResource resource = marker.getResource();
         if (marker.exists() && resource instanceof IFile) {
             IWorkbenchPage page = getTaskList().getSite().getPage();
             try {
                 IDE.openEditor(page, marker, OpenStrategy.activateOnOpen());
             } catch (PartInitException e) {
                 DialogUtil.openError(page.getWorkbenchWindow().getShell(),
                         TaskListMessages.GotoTask_errorMessage,
                         e.getMessage(), e);
             }
         }
     }
 }

